No. 9 (tie): Colleen Ballinger — $5 million

Colleen Ballinger and her alter ego, the hilariously incompetent Miranda Sings, have landed both a memoir, "Selp-Helf," and Netflix series to go along with a stand-up tour.

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No. 9 (tie): Rhett and Link — $5 million

Rhett and Link

Income: $5 million

Rhett McLaughlin and Charles Lincoln Neal III are a little old for the YouTube-star demographic — they're 39 and 38 years old — but they're insanely well known on the video platform.

Rhett and Link are best known for making hilarious, local-style ads for real companies, such as Ojai Valley Taxidermy and Red House Furniture, and they've gotten sponsorship from big brands for many of their videos. They host a morning talk show, "Good Mythical Morning," that snags superstar guests.

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No. 7 (tie): Germán Garmendia — $5.5 million

Germán Garmendia and Lenay Olsen
Getty/Frazer Harrison

Income: $5.5 million

Chilean YouTuber Germán Garmendia is Latin America's biggest YouTube star. The comedian and musician has two channels in the top 20. He released a book in 2016, titled "#Chupaelperro."

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No. 7 (tie): Markiplier — $5.5 million

Getty/Tommaso Boddi

Income: $5.5 million

Mark Fischbach, better known as Markiplier, is a YouTuber focused on gaming. He has an energetic style that involves a bit of swearing and a lot of emotion. Fischbach has ambitions beyond YouTube, as well.

"I want to push myself into music and acting — more traditional media stuff," he told Variety earlier this year. "If someone wants to make a movie and have me in it, I want to make sure I have the skill set to do it properly."

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No. 5 (tie): Tyler Oakley — $6 million

LGBTQ activist and YouTube personality Tyler Oakley mixes comedy with pop culture and politics. It's no wonder that he's found a supporter in Ellen DeGeneres, who signed him to her production company. Oakley also released a memoir in 2015, called "Binge."

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No. 5 (tie): Rosanna Pansino — $6 million

screenshot/YouTube

Income: $6 million

Rosanna Pansino has the nerdiest baking channel on YouTube — and also the most popular of any baking channel on the platform, period. Pansino's "Nerdy Nummies" channel puts a spin on normal recipes, including videos for food creations such as Pi Pie Pops and Princess Peach Cobbler.

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No. 4: Smosh — $7 million

Melly Lee/Courtesy of DEFY Media

Income: $7 million

Smosh is a comedy duo of YouTube veterans Ian Hecox and Anthony Padilla. Smosh was one of the first YouTube sensations, becoming well known for the duo's slapstick comedy videos that parody video games and pop culture. They have shown no signs of slowing down, and now run seven channels.

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No. 3: Lilly Singh — $7.5 million

Lilly Singh does everything from comedy sketches to music videos on her one-woman YouTube channel. Singh also has a YouTube star nickname — Superwoman — and a rabid fan base. She went on a worldwide "Trip to Island Unicorn" tour last year and released a feature film of the same name on YouTube Red, the company's premium service.

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No. 2: Roman Atwood — $8 million

YouTube/Screenshot

Income: $8 million

Roman Atwood's prank-filled YouTube channel almost seems more in line with the humor you'd typically see from stars on Vine, Twitter's video platform it's shutting down. Atwood has been dubbed YouTube's "most appalling prankster" — he's pretended to kill his own toddler multiple times to film his girlfriend's reactions. He's also filmed many less-horrifying prank videos for his channel.

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No. 1: PewDiePie — $15 million

YouTube/Screenshot

Income: $15 million

Felix Arvid Ulf Kjellberg is a foul-mouthed Swedish video game commentator who has dominated YouTube over the past few years. Kjellberg's videos show him playing various video games, while a box in the top corner of the screen shows his reactions to what's happening.

Many attribute his success to the attention he pays to his fans — Kjellberg spends lots of time talking about them, answering their questions in the YouTube comments section, and forming a community of "bros."

However, Kjellberg has said he will delete his massively popular YouTube channel on Friday, December 9, at 5 p.m. GMT, after hitting 50 million subscribers. He explains why in this video, but many aren't sure if he is being serious.